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Performance−Based Navigation (PBN) and Area Navigation (RNAV)

2. Use of a suitable RNAV system as an

Alternate Means of Navigation when  a VOR, DME,


locator facility including locator outer marker and

locator middle marker is operational and the

respective aircraft is equipped with operational

navigation equipment that is compatible with

conventional navaids. For example, if equipped with

a suitable RNAV system, a pilot may fly a procedure

or route based on operational VOR using that RNAV

system without monitoring the VOR. 


1. Additional information and associated requirements

are available in Advisory Circular 90-108 titled “Use of

Suitable RNAV Systems on Conventional Routes and

2. Good planning and knowledge of your RNAV system are
critical for safe and successful operations.
3. Pilots planning to use their RNAV system as a substitute
means of navigation guidance in lieu of an out−of−service


 may need to advise ATC of this intent and

4. The navigation database should be current for the
duration of the flight. If the AIRAC cycle will change
during flight, operators and pilots should establish
procedures to ensure the accuracy of navigation data,
including suitability of navigation facilities used to define
the routes and procedures for flight.  To facilitate validating
database currency, the FAA has developed procedures for
publishing the amendment date that instrument approach
procedures were last revised. The amendment date follows
the amendment number, e.g., Amdt 4 14Jan10. Currency of
graphic departure procedures and STARs may be
ascertained by the numerical designation in the procedure
title. If an amended chart is published for the procedure, or
the procedure amendment date shown on the chart is on or
after the expiration date of the database, the operator must
not use the database to conduct the operation.

b. Types of RNAV Systems that Qualify as a

Suitable RNAV System. When installed in accor-

dance with appropriate airworthiness installation

requirements and operated in accordance with

applicable operational guidance (for example,

aircraft flight manual and Advisory Circular

material), the following systems qualify as a suitable

RNAV system:

1. An RNAV system with TSO−C129/

−C145/−C146 equipment, installed in accordance

with AC 20−138, Airworthiness Approval of Global

Positioning System (GPS) Navigation Equipment for

Use as a VFR and IFR Supplemental Navigation

System, or AC 20−130A, Airworthiness Approval of

Navigation or Flight Management Systems Integrat-

ing Multiple Navigation Sensors, and authorized for

instrument flight rules (IFR) en route and terminal

operations (including those systems previously

qualified for “GPS in lieu of ADF or DME”

operations), or

2. An RNAV system with DME/DME/IRU

inputs that is compliant with the equipment

provisions of AC 90−100A, U.S. Terminal and

En Route Area Navigation (RNAV) Operations, for

RNAV routes. A table of compliant equipment is

available at the following website:




Approved RNAV systems using DME/DME/IRU, without

GPS/WAAS position input, may only be used as a substitute

means of navigation when specifically authorized by a

Notice to Airmen (NOTAM) or other FAA guidance for a

specific procedure. The NOTAM or other FAA guidance

authorizing the use of DME/DME/IRU systems will also

identify any required DME facilities based on an FAA

assessment of the DME navigation infrastructure.

c. Uses of Suitable RNAV Systems. Subject to

the operating requirements, operators may use a

suitable RNAV system in the following ways.

1. Determine aircraft position relative to, or

distance from a VOR (see NOTE 6 below), TACAN,

NDB, compass locator, DME fix; or a named fix

defined by a VOR radial, TACAN course, NDB

bearing, or compass locator bearing intersecting a

VOR or localizer course.

2. Navigate to or from a VOR, TACAN, NDB,

or compass locator.

3. Hold over a VOR, TACAN, NDB, compass

locator, or DME fix.

4. Fly an arc based upon DME.


1. The allowances described in this section apply even

when a facility is identified as required on a procedure (for

example, “Note ADF required”).
2. These operations do not include lateral navigation on
localizer−based courses (including localizer back−course
guidance) without reference to raw localizer data.
3. Unless otherwise specified, a suitable RNAV system
cannot be used for navigation on procedures that are


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